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5
Cautions Concerning Backup
Operation
This chapter explains the points to note about backup operations for this product.
• Although the data compression rate is estimated to be approximately 200%, it varies depending on
the data contents. For the data that was already compressed by software, the compression effects
by this product cannot be expected.
• The backup performance and backup capacity that can be used in one data cartridge varies depend-
ing on the following factors:
- The conditions (attrition, dust, etc.) of the recording surface of the data cassette to be used
- The dust and dirt condition of this product magnetic head
- Data compression rate
- The workload on the server
• When using a single data cassette over and over for backup operation, all the data can be lost if the
backup fails. Also, if a backuped data cassette tape becomes damaged, the data cannot be recov-
ered. Damage in the event of a failure can be minimized if two or more data cassettes are used for
backup operation.
Example: Performing backup using data cassettes for each day of the week is recommended.
• While performing backup using Windows Backup, if media release or unmounting are executed in
the Computer management → Storage → Removable storage, after backup is complete the media
cannot be ejected.
It is necessary to restart the server to eject the media. Therefore, when performing backup using
Windows Backup, do not perform media release or unmounting.
• When using backup software that contains the tape alert function, you may be notified of the end
of the tape lifespan after using it 100 times or more.
• When using this product in Windows server, do not remove this product using [Safely Remove
Hardware] in the task bar. When it is removed improperly, restart the server.
• Some backup software allows specifying execution of "Data verification" after backup. When this
is specified, the written data on the data cassette is read after backup and the written contents are
verified, which results in higher reliability (recommended).
However, note that this execution also leads to demerits, such as "taking longer time for backup
operation" and "reducing life time of the medium due to increase in the number of times the
medium is used".
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